lol, the Urumi is not useless. I've seen that show, they do some things right and do others horribly. Really, if you gave them a blunt katana, they'll probably label it a useless weapon, but fact remains that the blunt katana can still sever limbs through brute force, much like a broadsword. The Urumi is not much different, it's almost no different then the whip, except heavier and less of a snap, but it can definitely cut things with the proper strength. The one thing the show doesn't seem to take into consideration is the body type of the soldiers which is partially why the tests fail. I'm no expert, but even I knw a few basic principals about combat.